Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7b3be405d47eeb…

MALICIOUS

PDF

47.9 KB Created: 2020-08-14 12:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f7818e5acdff5320276f7cbb82ac37b SHA-1: b40332bc1b1b5a52bff4a9be049259185a86a179 SHA-256: ec7b3be405d47eebd0cb97a0b3064de7d76ab6e976047faf29336599ceaeb0e9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file exhibits characteristics of a malicious redirector, with numerous embedded links pointing to external resources. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to a known malicious redirector infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or distribution network. The ML classifier also strongly indicates maliciousness. The document body contains obfuscated text and a URL that appears to be part of the redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=script+tag+in+angularjs+template
    • http://files.greenvillechoralsociety.com/uploads/1/3/0/7/130776504/tabetuj.pdf
    • http://kezer.vintageinfused.net/uploads/1/3/1/4/131407226/91d2d058.pdf
    • http://wirejinu.cre8ivecake.com/uploads/1/3/1/4/131412032/fujenoremod.pdf
    • http://files.aurakuperbergart.com/uploads/1/3/0/7/130738997/kobeporubo.pdf
    • http://files.tywc.ca/uploads/1/3/0/8/130874380/1538a43a8717.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3112/files/pobarodaboko.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/class_javalaunchhelper_is_implemented_in_both.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/automobile_companies_in_pune_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6074/files/buzefufutikojobova.pdf
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/56221564189.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/70634578304.pdf
    • https://cdn.shopify.com/s/files/1/0435/0253/4822/files/persuasive_writing_samples.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/assamese_poem_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/eversource_outage_map_ct.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3105/files/java_person_class.pdf
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/nursing_care_plan_for_postpartum_hemorrhage.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/nursing_care_plan_for_postpart

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce6.bin
71ef3684029f6b826449fd3aa6710fede891f52f1f999e3faca2b8e9a9801886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE6 5432 bytes
font_01_sfnt_off00007f43.bin
c8a42c36ac267a95041690e2d42b5cce75bb812f5b2c063a0ce2cfbaee878620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F43 15848 bytes

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